scholarly journals On the Improved Mechanical Properties of Ball-Milled GNPs Reinforced Short Chain Branched-Polyethylene Nanocomposite: Micromechanical Modeling and Fractography Study

2021 ◽  
Vol 11 (20) ◽  
pp. 9420
Author(s):  
Dimitra Kourtidou ◽  
Konstantinos Tsongas ◽  
Maria-Eirini Grigora ◽  
Dimitrios Tzetzis ◽  
Dimitrios N. Bikiaris ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Ball Milling ◽  
Filler Content ◽  
Milling Process ◽  
Short Chain ◽  
Micromechanical Modeling ◽  
Melt Mixing ◽  
Crystallinity Degree ◽  
Branched Polyethylene ◽  
Ball Milling Process

Short-chain branched-Polyethylene (SCB-PE) is commonly utilized in hot and cold piping systems due to its high-temperature resistance. SCB-PE nanocomposites using graphene nanoplatelets (GNPs) as a reinforcing filler were synthesized in this work. The effect of the filler’s content and the ball-milling process on nanocomposites’ structure, tensile and shear properties was studied. Two series of nanocomposites have been prepared, one with and one without the ball-milling as a premixing step prior to the melt-mixing process. The ball-milling process induced a lower crystallinity degree of the SCB-PE nanocomposites than their solely melt-mixed counterpart. The tensile properties of the ball-milled samples presented a more profound enhancement with increasing filler content. The Ji and modified Halpin-Tsai micromechanical models were best fit to describe the experimental elastic modulus of the solely melt-mixed and the ball-milled nanocomposites, respectively. Fractography studies suggested that the detachment of the filler particles from the polymer matrix is avoided for lower GNPs contents of the ball-milled samples. Shear tests revealed that the shear strength increased and ductility decreased with increasing filler content in any case. The ball-milling process resulted in SCB-PE nanocomposites with superior mechanical properties compared to their solely melt-mixed counterparts.

scholarly journals Influence of Graphene Platelet Aspect Ratio on the Mechanical Properties of HDPE Nanocomposites: Microscopic Observation and Micromechanical Modeling

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1719
Author(s):  
Evangelia Tarani ◽  
Iouliana Chrysafi ◽  
Alfréd Kállay-Menyhárd ◽  
Eleni Pavlidou ◽  
Thomas Kehagias ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aspect Ratio ◽  
Filler Content ◽  
Graphene Nanoplatelets ◽  
Micromechanical Modeling ◽  
Melt Mixing ◽  
Percolation Effect ◽  
Mixing Method ◽  
Micro Deformation ◽  
Prediction Of Mechanical Properties

A series of high-density polyethylene nanocomposites filled with different diameter sizes (5, 15, and 25 μm) of graphene nanoplatelets at various amounts (0.5–5 wt.%) are prepared by the melt-mixing method. The effect of diameter size and filler content on the mechanical properties is reported, and the results are discussed in terms of morphology and the state of dispersion within the polymer matrix. The measured stiffness and strength of the nanocomposites were found to be mainly influenced by the filler aspect ratio and the filler-matrix adhesion. Fractography was utilized to study the embrittleness of the nanocomposites, and the observations revealed that a ductile to brittle transition is caused by a micro-deformation mechanism change in the nanocomposites. Several micromechanical models for the prediction of mechanical properties of nanocomposites, taking into consideration filler aspect ratio, percolation effect, and interphase regions, are considered. The three-phase model proposed by Ji accurately predicts the stiffness of graphene nanoplatelets with a higher diameter size, while Takayanagi modified model II was found to show good agreement with the experimental results of smaller ones at low filler content. This study demonstrates that the diameter size of the filler plays a central role in determining the mechanical properties.

The Effect of Carbon Nanotubes on the Tribological Behaviors of PEEK Composites

2011 ◽  
Vol 295-297 ◽  
pp. 140-143 ◽  
Author(s):  
W.Z. Nie
Keyword(s):  
Carbon Nanotubes ◽  
Wear Resistance ◽  
Ball Milling ◽  
Room Temperature ◽  
Compression Molding ◽  
Milling Process ◽  
Melt Mixing ◽  
Ball Milling Process ◽  
Material Stiffness ◽  
Material Ductility

In this work, carbon nanotubes(CNT) filled polyetheretherketone (PEEK), with CNT contents ranging from 1 to 5 vol.%, were compounded by a ball milling process performed under room temperature. Nanocomposites were prepared through compression molding as-milled CNT/PEEK mixtures without further melt mixing. The incorporation of CNT leads to a significant improvement in material stiffness and a decrease in material ductility. The wear resistance of PEEK is significantly improved after incorporating CNT and at a rather low CNT loading, i.e. 5 vol.%, the composite presents the optimum wear resistance.

Influence of oxygen induced during high-energy ball milling process on the mechanical properties of sintered nickel by SPS

2021 ◽  
Vol 856 ◽  
pp. 157869
Author(s):  
Arnaud Bolsonella ◽  
Foad Naimi ◽  
Olivier Heintz ◽  
Thomas Tricone ◽  
Hervé Couque ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Ball Milling ◽  
High Energy ◽  
Milling Process ◽  
High Energy Ball Milling ◽  
Ball Milling Process ◽  
Energy Ball

scholarly journals Mechanical properties of the Al-Mg/MWCNTs composite powders: The effects of ball milling process parameters

2021 ◽  
Author(s):  
Hossein Ahmadian
Keyword(s):  
Mechanical Properties ◽  
Ball Milling ◽  
Milling Time ◽  
Milling Process ◽  
X Ray Diffraction ◽  
Composite Powders ◽  
X Ray ◽  
Ball Milling Process ◽  
Carbon Nano Tubes ◽  
Ball Milling Time

Abstract The effects of multi-walled carbon nano-tubes (MWCNTs) and the ball milling parameters on the mechanical properties of the Al-Mg alloy powders were investigated. Three different composite powders were synthesized through ball-milling process at different time and milling rates. The microstructural and phase analyses were carried out via scanning electron microscopy and X-ray diffraction spectroscopy, respectively. The results indicated that increasing the ball-milling time and rate would lead to the formation of finer particles, which consequently intensifies the plastic deformation and then, results in lower crystallite size. The morphological investigations indicated that while the MWCNTs agglomerates in lower milling rates, increased milling rate not only improve the distribution of the MWCNTs, but also decreases the length of the nano-tubes and promotes their diffusion into Al-Mg matrix. The formation of Al-Mg intermetallic phases through the ball-milling process of the composite powders was also confirmed via microstructural investigations.

Effect of ball milling on the mechanical properties and crystallization of graphene nanoplatelets reinforced short chain branched‐polyethylene

2021 ◽  
pp. 50874
Author(s):  
Dimitra Kourtidou ◽  
Maria Eirini Grigora ◽  
Konstantinos Tsongas ◽  
Zoe Terzopoulou ◽  
Dimitrios Tzetzis ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Ball Milling ◽  
Graphene Nanoplatelets ◽  
Short Chain ◽  
Branched Polyethylene
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